Weekly ReportAug 10–16, 2026
Anesthesiology, week 33 edition
We read 250 papers and selected 3.
Summary
This week’s anesthesiology literature was led by a large pragmatic randomized trial showing no meaningful 30-day recovery advantage of total intravenous anesthesia over volatile anesthesia in older adults undergoing major noncardiac surgery. Other important advances included mechanistic evidence linking catecholaminergic cortical ignition to consciousness during anesthesia and a randomized dose-finding study identifying an approximately 0.16 μg/kg norepinephrine bolus to prevent postspinal hypotension during cesarean delivery. Across the week, research emphasized individualized hemodynamic management, opioid- and nausea-sparing recovery, airway technology, perioperative neurocognitive protection, and implementation of evidence-based obstetric and pediatric anesthesia practices. Several findings may influence practice now, but many require multicenter validation before routine adoption.
Selected Articles
1. Total Intravenous vs Volatile Inhalational Anesthesia for Major Noncardiac Surgery: A Randomized Clinical Trial.
In a pragmatic multicenter randomized trial of 2,508 adults aged 50 years or older undergoing major noncardiac surgery, total intravenous anesthesia did not improve days alive and at home at 30 days compared with volatile anesthesia. Mortality, delirium, quality of recovery, and major postoperative complications were also similar, although total intravenous anesthesia reduced thirst, hoarseness, and nausea and vomiting.
Impact: This is the largest and most clinically pragmatic head-to-head randomized comparison in the week. It directly challenges routine preference for total intravenous anesthesia and supports selecting anesthetic technique according to patient factors, procedure requirements, symptoms, expertise, and resources.
Clinical Implications: Clinicians should not expect TIVA to improve short-term recovery or major safety outcomes solely because of the anesthetic technique. TIVA or volatile anesthesia can be selected through individualized shared decision-making, with attention to postoperative nausea, airway symptoms, delirium risk, procedural needs, and local expertise.
Key Findings
- Days alive and at home at 30 days were nearly identical with TIVA and volatile anesthesia: 22.5 versus 22.4 days.
- There were no significant differences in mortality, delirium, quality of recovery, or major postoperative complications, while TIVA reduced thirst, hoarseness, and nausea and vomiting.
2. Catecholamine modulation of frontal cortical ignition during wakefulness, sleep and anesthesia.
Using causal chemogenetic manipulation and cortical stimulation in experimental animals, this mechanistic study showed that catecholamine activity, particularly from ventral tegmental area dopaminergic neurons, enhances propagation of activity into the anterior cingulate cortex. Ketamine and isoflurane suppressed visual-to-frontal cortical propagation and dopaminergic and basal forebrain cholinergic activity, suggesting overlapping but distinct mechanisms between sleep and general anesthesia.
Impact: The study provides a causal circuit-level model for how anesthetic states suppress conscious access rather than simply reducing global brain activity. It creates a potential framework for developing biomarkers of anesthetic depth, emergence, and altered consciousness.
Clinical Implications: The findings may eventually inform EEG or neuroimaging biomarkers for individualized anesthetic titration and emergence monitoring, but they remain preclinical. Human validation is required before this mechanism can guide clinical monitoring or treatment.
Key Findings
- Chemogenetic activation of catecholamine neurons increased visual cortex-evoked anterior cingulate cortical excitation, whereas inactivation reduced cortical ignition.
- Ketamine and isoflurane markedly suppressed visual-to-frontal cortical propagation and catecholaminergic and basal forebrain cholinergic activity.
3. Determination of the 90% Effective Dose of the Initial Bolus of Norepinephrine Followed by a Continuous Infusion to Prevent Hypotension in Elective Cesarean Delivery: A Randomized, Double-Blind, Up-Down Study.
In 60 evaluable women undergoing elective cesarean delivery under spinal anesthesia, the estimated ED90 of an initial norepinephrine bolus followed by continuous infusion was 0.157 μg/kg. Efficacy increased across doses from 0.13 to 0.19 μg/kg, with hypotension occurring in 12.2% of patients and few reported adverse events.
Impact: This randomized, double-blind dose-finding study provides a practical quantitative starting point for prophylactic norepinephrine protocols in obstetric spinal anesthesia. It addresses a common, clinically important complication where precise vasopressor dosing remains variable.
Clinical Implications: An initial norepinephrine bolus of approximately 0.16 μg/kg followed by titrated infusion may be considered when developing protocols to prevent postspinal hypotension during elective cesarean delivery. Implementation should include continuous hemodynamic monitoring and further maternal-fetal safety evaluation.
Key Findings
- The estimated ED90 for the initial norepinephrine bolus was 0.157 μg/kg by two complementary statistical methods.
- Effective rates increased from 60.0% at 0.13 μg/kg to 100.0% at 0.19 μg/kg; hypotension occurred in 12.2% of patients.